I can imagine there are scenarios where married couples with income disparities in cities like NYC and San Francisco end up splitting up, then the poorer party struggles to afford rent or cost of living on their income alone.
Also, some argue that marriage between different social classes may be more prone to marital issues and maybe possibly more likely to split up due to differences. So there's a case to be made that there are still gonna be a good number of parties who need financial support following the dissolution of a marriage.